class Counter{
    private int count = 0;
    public void add(){
        count++;
    }
    public int get(){
        return count;
    }
}

public class ThreadDemo1 {
    public static void main(String[] args) throws InterruptedException{
        Counter counter = new Counter();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(counter.get());
    }
}
